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• How can I learn to effectively write Pythonic code?

  - by Matt Fenwick

  I'm tired of getting downvoted and/or semi-rude comments on my Python answers, saying things like "this isn't Pythonic" or "that's not the Python way of doing things". To clarify, I'm not tired of getting corrected and downvoted, and I'm not tired of being wrong: I'm tired of feeling like there's a whole field of Python that I know nothing about,…

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• Pythonic use of the isinstance function?

  - by Pace

  Whenever I find myself wanting to use the isinstance() function I usually know that I'm doing something wrong and end up changing my ways. However, in this case I think I have a valid use for it. I will use shapes to illustrate my point although I am not actually working with shapes. I am parsing XML configuration files that look like the…

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• Questioning pythonic type checking

  - by Pace

  I've seen countless times the following approach suggested for "taking in a collection of objects and doing X if X is a Y and ignoring the object otherwise" def quackAllDucks(ducks): for duck in ducks: try: duck.quack("QUACK") except AttributeError: #Not a duck, can't quack, don't worry about it pass The…

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• Metaphor for task synchronization [closed]

  - by nkint

  I'm looking for a metaphor. A friend of mine taught me to use metaphors from nature, everyday life, math, and use them to design my projects. They can help in creating a better design or better understanding or the problem, and they are cool. Now I'm working on a project with hardware and micro-controllers in C. For convenience, I…

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• Which of these is pythonic? and Pythonic vs. Speed

  - by Kashyap Nadig

  Hi! I'm new to python and just wrote this module level function: def _interval(patt): """ Converts a string pattern of the form '1y 42d 14h56m' to a timedelta object. y - years (365 days), M - months (30 days), w - weeks, d - days, h - hours, m - minutes, s - seconds""" m =…

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• More pythonic way to iterate

  - by fmark

  I am using a module that is part of a commercial software API. The good news is there is a python module - the bad news is that its pretty unpythonic. To iterate over rows, the follwoing syntax is used: cursor = gp.getcursor(table) row = cursor.Next() while row: #do something with row …

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• What defines "pythonian" or "pythonic"?

  - by Thomas Owens

  I want to begin to learn Python, and I've seen that phrase come up here before, but I don't know exactly what it means. I've read some websites on Python scripting, but I don't recall ever seeing that (but I could have just glanced over it). What exactly makes something "pythonian" or…

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• pythonic way of selecing a random value that satisfies a certain predicate

  - by MK

  Suppose I have a list of elements and I want to randomly select an element from the list that satisfies a predicate. What is the pythonic way of doing this? I currently do a comprehension followed by a random.choice() but that is unnecessarily inefficient : intlist =…

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• Why does the word "Pythonic" exist?

  - by Billy ONeal

  Honestly, I hate the word "Pythonic" -- it's used as a simple synonym of "good" in many circles, and I think that's pretentious. Those who use it are silently saying that good code cannot be written in a language other than Python. Not saying Python is a bad language,…

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• pythonic way to associate list elements with their indices

  - by Dragan Chupacabrovic

  Hello Everybody, I have a list of values and I want to put them in a dictionary that would map each value to it's index. I can do it this way: >>> t = (5,6,7) >>> d = dict(zip(t, range(len(t)))) >>> d {5: 0, 6: 1, 7: 2} this is not…

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• What's the pythonic way of declaring variables?

  - by the_drow

  Usually declaring variables on assignment is considered a best practice in VBScript or JavaScript , for example, although it is allowed. Why does Python force you to create the variable only when you use it? Since Python is case sensitive can't it cause bugs…

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• What is the best way to documentate a system metaphor?

  - by SDReyes

  A metaphor help us to communicate with our project stakeholders, using a shared set of concepts and analogies. we develop them all the time, in one way or another. even the XP- programming highly recommend to get it defined since project start. How do you write…

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• What is the best way to document a system metaphor?

  - by SDReyes

  A metaphor help us to communicate with our project stakeholders, using a shared set of concepts and analogies. we develop them all the time, in one way or another. even the XP- programming highly recommend to get it defined since project start. How do you write…

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• E 2.0 Value Metaphors

  - by Tom Tonkin

  I guess I have been doing this too long. I can easily see the value of Enterprise 2.0 technology for an organization, but find it a challenge at times to convey that same value to others. I also know that I'm not the only one that has that issue. Others, that…

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• How to Convert multiple sets of Data going from left to right to top to bottom the Pythonic way?

  - by ThinkCode

  Following is a sample of sets of contacts for each company going from left to right. ID Company ContactFirst1 ContactLast1 Title1 Email1 ContactFirst2 ContactLast2 Title2 Email2 1 ABC John Doe CEO jd@abc.com Steve Bern …

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• Is it Pythonic to have a class keep track of its instances?

  - by Lightbreeze

  Take the following code snippet class Missile: instances = [] def __init__(self): Missile.instances.append(self) Now take the code: class Hero(): ... def fire(self): Missile() When the hero fires, a missile needs to be…

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• Abstracting away the type of a property

  - by L. De Leo

  In Python luckily most of the times you don't have to write getters and setters to get access to class properties. That said sometimes you'll have to remember that a certain property is a list or whatnot and a property would save you there by abstracting…

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• Python Forgiveness vs. Permission and Duck Typing

  - by darkfeline

  In Python, I often hear that it is better to "beg forgiveness" (exception catching) instead of "ask permission" (type/condition checking). In regards to enforcing duck typing in Python, is this try: x = foo.bar except AttributeError: pass else:…

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• What's the pythonic way to use getters and setters?

  - by Jorge

  I'm doing it like: def set_property(property,value): def get_property(property): or object.property = value value = object.property I'm new to Python, so i'm still exploring the syntax, and i'd like some advice on doing this.

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• Django Models / SQLAlchemy are bloated! Any truly Pythonic DB models out there?

  - by Luke Stanley

  "Make things as simple as possible, but no simpler." Can we find the solution/s that fix the Python database world? from someAmazingDB import * class Task (model): title = '' isDone = False db.taskList = [] #or db.taskList =…

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• a more pythonic way to express conditionally bounded loop?

  - by msw

  I've got a loop that wants to execute to exhaustion or until some user specified limit is reached. I've got a construct that looks bad yet I can't seem to find a more elegant way to express it; is there one? def ello_bruce(limit=None): …

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• "isnotnan" functionality in numpy, can this be more pythonic?

  - by Dragan Chupacabrovic

  Hello Everybody, I need a function that returns non-NaN values from an array. Currently I am doing it this way: >>> a = np.array([np.nan, 1, 2]) >>> a array([ NaN, 1., 2.]) >>> np.invert(np.isnan(a))…

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• How do I convert tuple of tuples to list in one line (pythonic)?

  - by ThinkCode

  query = 'select mydata from mytable' cursor.execute(query) myoutput = cursor.fetchall() print myoutput (('aa',), ('bb',), ('cc',)) Why is it (cursor.fetchall) returning a tuple of tuples instead of a tuple since my query is…

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• A metaphor for Drupal module's inner workings

  - by PHP thinker

  What is the best application workflow metaphor for Drupal module? In PHP frameworks we think MVC-style. How do we think inside Drupal? Asumming I am writing some user-oriented module like Shop, Catalog or Forum. As far as I…

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• What's wrong with relative imports in Python?

  - by Oddthinking

  I recently upgraded versions of pylint, a popular Python style-checker. It has gone ballistic throughout my code, pointing out places where I import modules in the same package, without specifying the full package path. …

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